Abrasion of NTN bearing troubleshooting analysis - bearing knowledge

All NTN bearing dirty is the most common cause of damage. In the initial installation, during the period of maintenance, NTN bearing enclosure via the air leakage, or even through the use of dirty lubricant, can enter the NTN bearing with dirt. Such as rust or other metal materials hard and rough foreign substances, can cause small sag, it with overload problem, acid erosion or corrosion caused by the depression are obviously different. Hard plug can cause seat. According to an industry representative, friction resistance, NTN bearing more than 95% of all failures from the defective assembly, not appropriate working conditions and usually can be found through the observation of the NTN bearing of other similar reasons. However, many of these failures can be a good lubricant exempted or delayed. Water, acid and other corrosive substances cause failure on the NTN bearing performance is, all circles of the exposed surface of red brown corrosion surface and a very small hole. In many cases, due to the motion to push the lubricant from the roll the ball track, no corrosion in ball or rolled in orbit. Corrosive abrasives oxidation of object in motion, it caused by the wear and on the seat of ball or roller, as well as their stay dark grey color, the red brown and NTN bearing surface relic contrast. Noise is a symptom. If axis normal work, what you hear voice should be soft whine and the looseness of the grease. Any other noise ultimately means failure. Use a screwdriver as a stethoscope to check new NTN bearing. Brief shriek that not completely lubrication. Rasp shaft or NTN bearing with obstruction or improper adjustment. Smooth, clean and pure tone that traces in the stillness of the seat. The irregular noise with ball bearing damage. Crunching sound means have dirty things.